Effect of plasma on gravitational lensing by a Schwarzschild black hole immersed in perfect fluid dark matter

2021 ◽  
Vol 104 (8) ◽  
Author(s):  
Farruh Atamurotov ◽  
Ahmadjon Abdujabbarov ◽  
Wen-Biao Han
Keyword(s):  
Black Hole ◽  
Dark Matter ◽  
Perfect Fluid ◽  
Gravitational Lensing ◽  
Schwarzschild Black Hole

scholarly journals Null Geodesics and Strong Field Gravitational Lensing in a String Cloud Background

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
M. Sharif ◽  
Sehrish Iftikhar
Keyword(s):  
Black Hole ◽  
Gravitational Lensing ◽  
Galactic Center ◽  
Deflection Angle ◽  
Orbital Motion ◽  
Strong Field ◽  
Schwarzschild Black Hole ◽  
Field Limit ◽  
Null Geodesics ◽  
Supermassive Black Hole

This paper is devoted to studying two interesting issues of a black hole with string cloud background. Firstly, we investigate null geodesics and find unstable orbital motion of particles. Secondly, we calculate deflection angle in strong field limit. We then find positions, magnifications, and observables of relativistic images for supermassive black hole at the galactic center. We conclude that string parameter highly affects the lensing process and results turn out to be quite different from the Schwarzschild black hole.

scholarly journals Weak and strong deflection gravitational lensing by a renormalization group improved Schwarzschild black hole

2019 ◽  
Vol 79 (12) ◽  
Author(s):  
Xu Lu ◽  
Yi Xie
Keyword(s):  
Black Hole ◽  
Renormalization Group ◽  
Gravitational Lensing ◽  
Galactic Center ◽  
Quantum Effect ◽  
Apparent Size ◽  
Great Care ◽  
Schwarzschild Black Hole ◽  
Sgr A ◽  
Near Future

AbstractWeak and strong deflection gravitational lensing by a renormalization group improved Schwarzschild black hole is investigated and its observables are found. By taking the supermassive black holes Sgr A* and M87* respectively in the Galactic Center and at the center of M87 as lenses, we estimate these observables and analyse possibility of detecting this quantum improvement. It is not feasible to distinguish such a black hole by most observables in the near future except for the apparent size of the shadow. We also note that directly using measured shadow of M87* to constrain this quantum effect requires great care.

scholarly journals Dynamics of test particles around a Bardeen black hole surrounded by perfect fluid dark matter

2020 ◽  
Vol 102 (10) ◽  
Author(s):  
Bakhtiyor Narzilloev ◽  
Javlon Rayimbaev ◽  
Sanjar Shaymatov ◽  
Ahmadjon Abdujabbarov ◽  
Bobomurat Ahmedov ◽  
...  
Keyword(s):  
Black Hole ◽  
Dark Matter ◽  
Perfect Fluid ◽  
Test Particles

scholarly journals Dynamics and epicyclic motions of particles around the Schwarzschild–de Sitter black hole in perfect fluid dark matter

2021 ◽  
Vol 81 (8) ◽  
Author(s):  
Javlon Rayimbaev ◽  
Sanjar Shaymatov ◽  
Mubasher Jamil
Keyword(s):  
Black Hole ◽  
Dark Matter ◽  
Perfect Fluid ◽  
Matter Field ◽  
De Sitter ◽  
Circular Orbits ◽  
Test Particles ◽  
Remarkable Result ◽  
The Impact ◽  
Twin Peak

AbstractIn this paper, we investigate circular orbits for test particles around the Schwarzschild–de Sitter (dS) black hole surrounded by perfect fluid dark matter. We determine the region of circular orbits bounded by innermost and outermost stable circular orbits. We show that the impact of the perfect fluid dark matter shrinks the region where circular orbits can exist as the values of both innermost and outermost stable circular orbits decrease. We find that for specific lower and upper values of the dark matter parameter there exist double matching values for inner and outermost stable circular orbits. It turns out that the gravitational attraction due to the dark matter contribution dominates over cosmological repulsion. This gives rise to a remarkable result in the Schwarzschild–de Sitter black hole surrounded by dark matter field in contrast to the Schwarzschild–de Sitter metric. Finally, we study epicyclic motion and its frequencies with their applications to twin peak quasi-periodic oscillations (QPOs) for various models. We find the corresponding values of the black hole parameters which could best fit and explain the observed twin peak QPO object GRS 1915+109 from microquasars.

scholarly journals Axion-plasmon or magnetized plasma effect on an observable shadow and gravitational lensing of a Schwarzschild black hole

2021 ◽  
Vol 104 (6) ◽  
Author(s):  
Farruh Atamurotov ◽  
Kimet Jusufi ◽  
Mubasher Jamil ◽  
Ahmadjon Abdujabbarov ◽  
Mustapha Azreg-Aïnou
Keyword(s):  
Black Hole ◽  
Gravitational Lensing ◽  
Magnetized Plasma ◽  
Schwarzschild Black Hole ◽  
Plasma Effect

scholarly journals Shadow cast by a rotating and nonlinear magnetic-charged black hole in perfect fluid dark matter

2021 ◽  
pp. 2150112
Author(s):  
Tian-Chi Ma ◽  
He-Xu Zhang ◽  
Peng-Zhang He ◽  
Hao-Ran Zhang ◽  
Yuan Chen ◽  
...  
Keyword(s):  
Black Hole ◽  
Dark Matter ◽  
Perfect Fluid ◽  
Emission Rate ◽  
Magnetic Charge ◽  
Spherically Symmetric ◽  
Intensity Parameter ◽  
Shadow Cast ◽  
Sgr A ◽  
Charge Formula

In this paper, we derived an exact solution of the spherically symmetric Hayward black hole surrounded by perfect fluid dark matter (PFDM). By applying the Newman–Janis algorithm, we generalized it to the corresponding rotating black hole. Then, we studied the shadows of rotating Hayward black hole in PFDM. The apparent shape of the shadow depends upon the black hole spin [Formula: see text], the magnetic charge [Formula: see text] and the PFDM intensity parameter [Formula: see text]. The shadow is a perfect circle in the non-rotating case [Formula: see text] and a deformed one in the rotating case [Formula: see text]. For a fixed value of [Formula: see text], the size of the shadow increases with the increasing [Formula: see text], but decreases with the increasing [Formula: see text]. We further investigated the black hole emission rate. We found that the emission rate decreases with the increasing [Formula: see text] (or [Formula: see text]) and the peak of the emission shifts to lower frequency. Finally, we discussed the observational prospects corresponding to the supermassive black hole Sgr A[Formula: see text] at the center of the Milky Way.

scholarly journals Gravitational Lensing and Wormhole Shadows

2021 ◽  
Vol 65 (12) ◽  
pp. 1185-1193
Author(s):  
M. A. Bugaev ◽  
I. D. Novikov ◽  
S. V. Repin ◽  
A. A. Shelkovnikova
Keyword(s):  
Black Hole ◽  
Gravitational Lensing ◽  
Formation Process ◽  
Gravitational Mass ◽  
Schwarzschild Black Hole ◽  
Scattering Of Light ◽  
Light Rays

Abstract The problem of bending and scattering of light rays passing outside the entrance of a wormhole with zero gravitational mass is considered. The process of ray capture by a wormhole, as well as the formation process of a shadow when illuminated by a standard screen, is investigated. These mechanisms are also compared to the case of light ray motion in the vicinity of the Schwarzschild black hole.

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